Java

Ed25519ph Sign and Verify

See more Ed25519 Examples

Demonstrates how to create an Ed25519ph signature, and then to verify it.

Note: This example requires Chilkat v9.5.0.91 or greater.

Chilkat2 Java

import com.chilkatsoft.chilkat2.BinData;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.EdDSA;
import com.chilkatsoft.chilkat2.PrivateKey;
import com.chilkatsoft.chilkat2.PublicKey;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example assumes the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        // Use the following test vector from https://www.rfc-editor.org/rfc/rfc8032#page-30

        //    -----TEST abc
        //
        //    ALGORITHM:
        //    Ed25519ph
        //
        //    SECRET KEY:
        //    833fe62409237b9d62ec77587520911e
        //    9a759cec1d19755b7da901b96dca3d42
        //
        //    PUBLIC KEY:
        //    ec172b93ad5e563bf4932c70e1245034
        //    c35467ef2efd4d64ebf819683467e2bf
        //
        //    MESSAGE (length 3 bytes):
        //    616263
        //
        //    SIGNATURE:
        //    98a70222f0b8121aa9d30f813d683f80
        //    9e462b469c7ff87639499bb94e6dae41
        //    31f85042463c2a355a2003d062adf5aa
        //    a10b8c61e636062aaad11c2a26083406

        String privKeyHex = "833fe62409237b9d62ec77587520911e9a759cec1d19755b7da901b96dca3d42";
        String pubKeyHex = "ec172b93ad5e563bf4932c70e1245034c35467ef2efd4d64ebf819683467e2bf";

        PrivateKey privKey = new PrivateKey();
        try {
            privKey.loadEd25519(privKeyHex, pubKeyHex);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // The data to be signed...
        BinData bd = new BinData();
        bd.appendEncoded("616263", "hex");

        EdDSA eddsa = new EdDSA();
        // Indicate we want the Ed25519ph instance.
        eddsa.setAlgorithm("Ed25519ph");

        String hexSig = eddsa.signBdENC(bd, "hexlower", privKey);

        System.out.println("signature = " + hexSig);

        // The expected output is: 98a70222f0b8121aa9d30f813d683f80....

        // Verify the signature..
        PublicKey pubKey = new PublicKey();
        try {
            pubKey.loadEd25519(pubKeyHex);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        try {
            eddsa.verifyBdENC(bd, hexSig, "hexlower", pubKey);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            System.out.println("Failed to verify the signature.");
            return;
        }

        System.out.println("The Ed25519ph signature is verified!");
    }
}